What is the replacement of 'scene.render.layers['RenderLayer']' in blender 2.8?
Render layers have been replaced by View Layers. Recommend do a search in the API docs or use the python console to figure out how to access the ViewLayers of the current scene:
 &gt;&gt;&gt; C.scene.view_
                 layers
                 settings

&gt;&gt;&gt; for vl in C.scene.view_layers: # Iterate through all view layers
...     print (vl.name) # print the name
...     
View Layer
View Layer.001
View Layer.002
...

You can also access the current ViewLayer (in context) by using bpy.context.view_layer (or by using C convenience variable in the console C.view_layer):
&gt;&gt;&gt; C.view_layer # View layer reference
bpy.data.scenes['Scene'].view_layers[&quot;View Layer&quot;]

&gt;&gt;&gt; C.view_layer.name # View layer name
'View Layer.001'

Another way is using get(&lt;LAYERNAME&gt;) on Scene.ViewLayers collection:
&gt;&gt;&gt; C.scene.view_layers.get('View Layer')
bpy.data.scenes['Scene'].view_layers[&quot;View Layer&quot;]

&gt;&gt;&gt; my_vl = C.scene.view_layers.get('View Layer')
&gt;&gt;&gt; my_vl.name
'View Layer'


Basic example on how to set attributes of the current view layer (in context):
import bpy

# Get the current view layer
vl = bpy.context.view_layer

# Set uv pass attribute
vl.use_pass_uv = True

# Set normal pass attribute
vl.use_pass_normal = True

# Enable diffuse light passes
vl.use_pass_diffuse_direct = True
vl.use_pass_diffuse_indirect = True
vl.use_pass_diffuse_color = True

Example on how to enable the 'UV' as well as the 'Normal' pass on all view layers in the scene:
import bpy

for vl in bpy.context.scene.view_layers:
    vl.use_pass_uv = True       # Enable UV pass
    vl.use_pass_normal = True   # Enable normal pass